Angular6:使用本地库时没有提供注射器的提供程序 [英] Angular6: No Provider for Injector when using local library

问题描述

我对AngularJS发布的Angular版本有些陌生，因此决定尝试一下.我想要做的是建立一个UI组件库，以及一个将使用该库的应用程序.在我的库中，我决定将这些组件创建为WebComponents，因此按照到目前为止找到的教程，我会得到类似的

I'm somewhat new to Angular versions post AngularJS and decided to give them a try. What I want to do is to build a library of UI components, and an application that will consume the said library. In my library, I decided to create the components as WebComponents, so following the tutorials I've found so far, I have something like

import { Injector, NgModule } from '@angular/core'
import { createCustomElement } from '@angular/elements';
import { MyButtonComponent} from './my-button.component'

@NgModule({
    declarations: [MyButtonComponent],
    entryComponents: [MyButtonComponent]
})
export class MyButtonModule {
    constructor(injector: Injector) {
        const myButton = createCustomElement(MyButtonComponent, { injector });
        customElements.define('my-button', myButton);
    }
}

对于我的自定义组件.如果我将组件的所有文件(模块，组件，模板和SCSS文件)直接添加到我的应用程序中，它将按预期工作，因此我知道组件声明是正确的.但是，如果在我的应用程序中包括库中的组件，则使用ng serve运行我的应用程序时，会看到错误:

For my custom component. If I add all the files (the module, the component, template and SCSS files) for my component directly to my application it works as expected, so I know my component declaration is right. However, if in my application I include the component from my library, when running my app with ng serve, I see the error:

Error: StaticInjectorError(AppModule)[MyButtonModule -> Injector]: 
  StaticInjectorError(Platform: core)[MyButtonModule -> Injector]: 
    NullInjectorError: No provider for Injector!

我正在使用Angular 6，并且两个项目都在本地运行，并且正在使用ng-packagr捆绑我的库.我在库中添加了@angular/core和@angular/elements作为peerDependencies，并且在主应用程序中我必须添加

I'm using Angular 6 and I have both projects running locally and I'm using ng-packagr to bundle my library. I added @angular/core and @angular/elements as peerDependencies in my library, and in my main app I had to add

"resolutions": {
    "@angular/core": "6.1.4"
}

解决错误cannot redeclare block-scoped variable 'ngDevMode'(不确定是否相关).最初，我认为注入错误可能是由此引起的，但是我已将preserveSymlinks添加到我的angular.json文件中，但仍然出现错误.

To solve the error cannot redeclare block-scoped variable 'ngDevMode' (not sure if this is related or not). Initially I thought the injection error could be caused by this but I've added the preserveSymlinks to my angular.json file and I still have the error.

有什么想法可能导致这种情况吗?

Any thoughts on what might be causing this?

更新:如果我从库文件夹中手动复制文件并将其粘贴到主应用程序的node_modules文件夹中，它将起作用，这使我认为这涉及符号链接.

UPDATE: If I copy the files manually from my library folder and paste them inside the node_modules folder of my main app it works, which leads me to think it's something involve symbolic links.

推荐答案

使用npm link版本的库运行业力，需要在test(builder-angular:karma部分)angular.json中添加preserveLinks: true:

to run karma with npm link'ed library its required to add preserveLinks: true in test (builder-angular:karma section) angular.json:

"test": {
      "builder": "@angular-devkit/build-angular:karma",
      "options": {
        "main": "src/test.ts",
        "preserveSymlinks": true,
        // ...

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